/* ── Reset & variables ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:          #0f0f1a;
  --bg-card:     #1a1a2e;
  --bg-card2:    #16213e;
  --border:      #2a2a3e;
  --accent:      #00e5a0;
  --accent2:     #00b4d8;
  --text:        #e8e8f0;
  --text-muted:  #8888aa;
  --danger:      #ff4757;
  --warning:     #ffa502;
  --success:     #2ed573;
  --radius:      12px;
  --radius-sm:   8px;
  --shadow:      0 4px 24px rgba(0,0,0,.4);
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Typography ──────────────────────────────────────────────────── */
h1 { font-size: clamp(1.8rem, 4vw, 3rem); font-weight: 800; line-height: 1.15; }
h2 { font-size: clamp(1.3rem, 3vw, 1.8rem); font-weight: 700; }
h3 { font-size: 1.1rem; font-weight: 700; }
a  { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Layout ──────────────────────────────────────────────────────── */
.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 1.5rem;
}
.site-main { flex: 1; }

/* ── Header ──────────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15,15,26,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.site-header .container {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding-top: .9rem;
  padding-bottom: .9rem;
}
.logo {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--text);
  text-decoration: none;
}
.logo-icon { font-size: 1.4rem; }
.logo-text { background: linear-gradient(135deg, var(--accent), var(--accent2)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.main-nav { display: flex; gap: 1.5rem; margin-left: auto; }
.nav-link { color: var(--text-muted); font-weight: 500; transition: color .2s; }
.nav-link:hover, .nav-link.active { color: var(--accent); text-decoration: none; }
.btn-panel {
  padding: .4rem .9rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: .85rem;
  white-space: nowrap;
  transition: border-color .2s, color .2s;
}
.btn-panel:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

/* ── Footer ──────────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  text-align: center;
  color: var(--text-muted);
  font-size: .85rem;
}
.site-footer a { color: var(--text-muted); }
.site-footer a:hover { color: var(--accent); }

/* ── Buttons ─────────────────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .75rem 1.75rem;
  background: var(--accent);
  color: #0f0f1a;
  border: none;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: opacity .2s, transform .1s;
  text-decoration: none;
}
.btn-primary:hover { opacity: .9; transform: translateY(-1px); text-decoration: none; color: #0f0f1a; }
.btn-primary.btn-small { padding: .45rem 1rem; font-size: .85rem; border-radius: var(--radius-sm); }
.btn-primary.btn-full { width: 100%; justify-content: center; }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .75rem 1.75rem;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: border-color .2s, color .2s;
  text-decoration: none;
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  padding: .45rem 1rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .85rem;
  cursor: pointer;
  transition: color .2s, border-color .2s;
  text-decoration: none;
}
.btn-ghost:hover { color: var(--text); border-color: var(--text-muted); text-decoration: none; }

/* ── Badges ──────────────────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: .25rem .65rem;
  border-radius: 99px;
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
}
.difficulty-beginner     { background: rgba(46,213,115,.15); color: var(--success); }
.difficulty-intermediate { background: rgba(255,165,2,.15);  color: var(--warning); }
.difficulty-advanced     { background: rgba(255,71,87,.15);  color: var(--danger); }

.muscle-tag {
  display: inline-block;
  padding: .2rem .6rem;
  background: rgba(0,229,160,.1);
  color: var(--accent);
  border-radius: 99px;
  font-size: .75rem;
}

/* ── Page header ─────────────────────────────────────────────────── */
.page-header {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--border);
}
.page-header p { color: var(--text-muted); margin-top: .5rem; }

/* ── Breadcrumb ──────────────────────────────────────────────────── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: .5rem;
  color: var(--text-muted);
  font-size: .9rem;
  margin-bottom: 1rem;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent); }

/* ── Hero section ────────────────────────────────────────────────── */
.hero { padding: 5rem 0 4rem; overflow: hidden; }
.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.hero-headline {
  background: linear-gradient(135deg, var(--text) 40%, var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 1rem;
}
.hero-sub { color: var(--accent2); font-weight: 600; font-size: 1.1rem; margin-bottom: 1rem; }
.hero-intro { color: var(--text-muted); max-width: 480px; margin-bottom: 2rem; line-height: 1.7; }
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

.hero-demo {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 2rem;
  position: relative;
  box-shadow: var(--shadow), 0 0 60px rgba(0,229,160,.05);
}
.demo-badge {
  position: absolute;
  top: 1rem; right: 1rem;
  background: var(--accent);
  color: #0f0f1a;
  font-size: .75rem;
  font-weight: 800;
  padding: .2rem .6rem;
  border-radius: 99px;
}
.skeleton-svg { width: 100%; max-width: 200px; display: block; margin: 0 auto; }
.demo-stats {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.demo-stat { color: var(--text-muted); font-size: .9rem; }
.demo-stat strong { color: var(--accent); font-size: 1.3rem; display: block; }

/* ── Exercise preview cards ──────────────────────────────────────── */
.exercises-preview { padding: 4rem 0; }
.section-title { margin-bottom: 2rem; }
.exercise-cards { display: flex; flex-direction: column; gap: 1rem; }

.exercise-preview-card {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1.25rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color .2s, transform .15s;
  text-decoration: none;
  color: var(--text);
}
.exercise-preview-card:hover { border-color: var(--accent); transform: translateX(4px); text-decoration: none; color: var(--text); }
.exercise-preview-icon { font-size: 2.5rem; flex-shrink: 0; }
.exercise-preview-info { flex: 1; }
.exercise-preview-info h3 { margin-bottom: .25rem; }
.exercise-preview-info p { color: var(--text-muted); font-size: .9rem; }
.exercise-preview-arrow { color: var(--text-muted); font-size: 1.3rem; }

/* ── Programs preview ────────────────────────────────────────────── */
.programs-preview { padding: 4rem 0; border-top: 1px solid var(--border); }
.programs-section { padding: 3rem 0; }
.programs-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.5rem; }

.program-card {
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color .2s;
  text-decoration: none;
  color: var(--text);
  gap: .75rem;
}
.program-card:hover { border-color: var(--accent); text-decoration: none; color: var(--text); }
.program-card-header { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.program-card h2 { font-size: 1.1rem; }
.program-card p { color: var(--text-muted); font-size: .9rem; flex: 1; }
.program-footer { display: flex; gap: 1rem; color: var(--text-muted); font-size: .85rem; margin-top: .5rem; }
.program-exercises-preview { display: flex; gap: .5rem; flex-wrap: wrap; }
.exercise-chip {
  padding: .25rem .65rem;
  background: rgba(0,229,160,.08);
  border: 1px solid rgba(0,229,160,.2);
  border-radius: 99px;
  font-size: .8rem;
  color: var(--accent);
}

/* ── Movements list ──────────────────────────────────────────────── */
.movements-grid { padding: 3rem 0; }
.movements-list { display: flex; flex-direction: column; gap: 1rem; }

.movement-card {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color .2s;
}
.movement-card:hover { border-color: var(--border); }
.movement-card-icon { font-size: 3rem; flex-shrink: 0; }
.movement-card-body { flex: 1; }
.movement-card-header { display: flex; align-items: center; gap: 1rem; margin-bottom: .5rem; }
.movement-card-body p { color: var(--text-muted); margin-bottom: .75rem; }
.muscles-tags { display: flex; gap: .4rem; flex-wrap: wrap; }
.movement-card-actions { display: flex; flex-direction: column; gap: .5rem; flex-shrink: 0; }

/* ── Movement detail ─────────────────────────────────────────────── */
.movement-hero { display: flex; align-items: center; gap: 1.5rem; margin-top: 1rem; }
.movement-hero-icon { font-size: 4rem; }
.movement-meta { display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; margin-top: .5rem; }
.movement-detail { display: grid; grid-template-columns: 1fr 300px; gap: 2rem; padding: 3rem 0; }
.movement-content { display: flex; flex-direction: column; gap: 2rem; }
.movement-section h2 { margin-bottom: 1rem; }
.movement-section p { color: var(--text-muted); line-height: 1.7; }
.instructions-text { color: var(--text-muted); line-height: 1.8; }
.config-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.config-item {
  padding: 1rem;
  background: var(--bg-card2);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: .25rem;
}
.config-label { color: var(--text-muted); font-size: .8rem; text-transform: uppercase; }
.config-value { font-size: 1.5rem; font-weight: 700; color: var(--accent); }

/* ── Program detail ──────────────────────────────────────────────── */
.program-hero-header { margin-top: .5rem; }
.program-badges { display: flex; gap: .5rem; flex-wrap: wrap; margin-top: .75rem; }
.program-detail { display: grid; grid-template-columns: 1fr 280px; gap: 2rem; padding: 3rem 0; }
.program-content { display: flex; flex-direction: column; gap: 2rem; }
.program-section h2 { margin-bottom: 1.25rem; }
.exercises-list { display: flex; flex-direction: column; gap: .75rem; }

.exercise-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.exercise-item-number {
  width: 28px;
  height: 28px;
  background: rgba(0,229,160,.15);
  color: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: .85rem;
  flex-shrink: 0;
}
.exercise-item-icon { font-size: 1.8rem; flex-shrink: 0; }
.exercise-item-info { flex: 1; }
.exercise-item-info h3 { margin-bottom: .25rem; }
.exercise-item-meta {
  display: flex;
  align-items: center;
  gap: .75rem;
  color: var(--text-muted);
  font-size: .9rem;
}
.rest-time { color: var(--accent2); }

/* ── Sidebar cards ───────────────────────────────────────────────── */
.movement-sidebar, .program-sidebar { padding-top: 1rem; }
.cta-card {
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  position: sticky;
  top: 80px;
}
.cta-card h3 { margin-bottom: .5rem; }
.cta-card p { color: var(--text-muted); font-size: .9rem; margin-bottom: 1.25rem; }
.program-meta-item { color: var(--text-muted); font-size: .85rem; }

/* ── Empty state ─────────────────────────────────────────────────── */
.empty-state { color: var(--text-muted); text-align: center; padding: 3rem; }

/* ── Responsive ──────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .hero .container { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .movement-detail, .program-detail { grid-template-columns: 1fr; }
  .movement-sidebar, .program-sidebar { display: none; }
  .main-nav { gap: 1rem; font-size: .9rem; }
  .programs-grid { grid-template-columns: 1fr; }
}